AISI 4130 is a low-alloy steel known for its strength and toughness. It contains chromium and molybdenum, which enhance its hardenability and resistance to wear. This steel is commonly used in applications requiring high strength-to-weight ratios, such as in the aerospace and automotive industries. Due to its excellent weldability and machinability, AISI 4130 is often used in the manufacturing of components like gears, shafts, and frames. It can be heat-treated to improve its mechanical properties, making it a versatile choice for various engineering applications.